Finding the Fourth Proportional to 1,392.86, 1,921.77 and 803.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.86 : 1,921.77 = 803.54 : x
2. Step 2: Convert to fraction form
   1,392.86/1,921.77 = 803.54/x
3. Step 3: Cross multiply
   1,392.86x = 1,921.77 × 803.54
4. Step 4: Simplify right side
   1,392.86x = 1,544,219.07
5. Step 5: Solve for x
   x = 1,544,219.07/1,392.86
6. Step 6: Final answer
   x = 1,108.67